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3 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x KF320, Elite Series: Brushed Nickel / Stainless Steel Faucet
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR125
1 x SC725, Specialty Filter Chloramines / Hydrogen Sulfide Removal
4 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
2 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x Bundle Filter KPAK-104m Sediment Carbon Block DI Resin Membrane
1 x NM-5103, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x ERP500 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x 205, 2nd stage carbon block filter (replace every 12 months)
2 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x NM-5104, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x SC412, Water Softening Filter Calcium Magnesium Hardness Removal
2 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO155
1 x 5th stage 225 Inline Alkaline filter with clear housing (annual)
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR122
5 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x Bundle Filter Annual set KPAK-104 Sediment Carbo Block DI Resin
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
2 x SV-24DC-14, Solenoid Valve ESO 1/4" plastic, 24V DC
1 x 3150, 4th stage TFC-150 US membrane filter (every 2-3 yrs)
4 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x .SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
2 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x 756SET, Aquatec Permeate Pump Reverse Osmosis System ERP1000
3 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
2 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR104H
1 x *Discontinued* RO585
1 x 385, 4th stage TFC 75/85 US membrane filter (every 2-3 yrs)
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x 773, AC Booster Pump Assembly Large 150-200GPD RO systems SET
1 x *Discontinued* RD106
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
2 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x BBK10, Replacement Filter Big Blue Whole House WH-1134
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
2 x 719, Drain Saddle Clamp / Valve
1 x FM-6710M-88 1" Digital Flow Meter count up Total GPM 56" cable
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
2 x 752, DC Booster Pump w/ Transformer
1 x .RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x SV-110AC-14, Solenoid Valve 1/4" plastic 110VAC ESO
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x AQF-600-102, Flow Meter Panel Mount 3/8" MPT
1 x WH1134 Whole House Restaurant Filter System Sediment Carbon Big
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x 578, TDS Water Quality Meter tds-3
1 x FM-8100TG44, DigiFlow Digital Water Flow Rate Meter
1 x DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x KT-103, Optional Manual Membrane Flush Valve
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO

View Cart$6,290.26
Specials Log InCreate Account Checkout  Shopping Cart129 item(s)
3 x Optional 225UP 5th stage Inline Alkaline upgrade(includes media)
1 x KF320, Elite Series: Brushed Nickel / Stainless Steel Faucet
1 x 1st stage SF05 sediment filter (replace every 6-12 months)
1 x FPK, 6 pcs Fitting Pack Union Connector 1/4" quarter inch
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR125
1 x SC725, Specialty Filter Chloramines / Hydrogen Sulfide Removal
4 x Wrench 2 pcs 566 Standard Filter Housing Opener Double Better
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle RD102
1 x .RO260 Aquarium 300G REVERSE OSMOSIS AEROPONICS HYDROPONICS RO
2 x Parts, Ro Water System Installation Parts Bag 1/4"
1 x Bundle Filter KPAK-104m Sediment Carbon Block DI Resin Membrane
1 x NM-5103, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
2 x Optional: 566 Filter Housing Wrench Opener WaterGeneral System
1 x ERP500 Aquatec Permeate Pump Reverse Osmosis RO System USA made
1 x 205, 2nd stage carbon block filter (replace every 12 months)
2 x FPK11, High Quality Fitting and Connector 1/4" (Value-Pack)
1 x NM-5104, HONEYWELL COUNTERTOP WATER FILTER *DISCONTINUED* SW1
1 x AMTU-0404 Male Tee Union Connector NPT Thread 1/4" Quick Connect
1 x SC412, Water Softening Filter Calcium Magnesium Hardness Removal
2 x Value Pack- Entire 3 Years of Replacement Filters Bundle RO155
1 x 5th stage 225 Inline Alkaline filter with clear housing (annual)
1 x RF62, Replacement filter for CT-6000, UC7000, SW-1, and SW-1C
2 x 205 2nd stage solid carbon block filter (replace every 12 month)
2 x Optional: 564 Membrane Filter Housing Wrench Opener
1 x 205, 3rd stage solid carbon block filter (replace every 12month)
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR122
5 x KM701C, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x Bundle Filter Annual set KPAK-104 Sediment Carbo Block DI Resin
1 x PSW-2100 Aquatec Pressure Switch 100 psi shut off 1/4 tubing TSO
1 x CPR-150G, Pressure Regulator with Pressure Gauge (0-125 psi)
1 x 4042-K Male Elbow Fitting Compression type(membrane housing use)
1 x MK8002, Maintenance kit for double membrane system RD322 RO260
1 x 201, 1st stage sediment filter (replace every 6-12 months)
1 x 3150, 5th stage TFC-150 US membrane filter (every 2-3 years)
1 x 673, Replacement UV Lamp Light for 602 (6 Watts)
1 x 733, Built-in Pressure Gauge 0 to 150 psi for Koolermax RO syste
2 x SV-24DC-14, Solenoid Valve ESO 1/4" plastic, 24V DC
1 x 3150, 4th stage TFC-150 US membrane filter (every 2-3 yrs)
4 x 532w, PAE RO Storage Pressure Osmosis Water Tank Container 4G
1 x 290, CB2010BB Big Blue 20" Carbon Block Filter WH20 WH250 WH2201
1 x .SW-1 COUNTERTOP WATER FILTER SYSTEM (WHITE HOUSING)
1 x PSW-260 Aquatec Pressure Switch 60 psi shut off 1/4" tubing TSO
1 x SV-24DC-38-Brass KSD Solenoid Valve 3/8" brass 24V DC ESO
2 x CP-OR35+701 O-RING FOR WATERGENERAL BOTTOM FILTER HOUSING CASING
1 x Conversion Kit, Convert Aquarium to Drinking RO Water System
1 x 756SET, Aquatec Permeate Pump Reverse Osmosis System ERP1000
3 x Special, Output Conversion Kit Convert from 1/4" to 3/8"
1 x 2542-K, Female Connector 1/4 OD 1/8 FNPT Compression Fitting
1 x O-RING RINGS FOR WH20 WHOLE HOUSE SYSTEM HOUSING BIG BLUE 20"
2 x KF355UP, SUBSTITUTE/Upgrade to Antique Brushed Brass Iron Finish
1 x Value Pack- Entire 3 Years of Replacement Filters Bundle AR104H
1 x *Discontinued* RO585
1 x 385, 4th stage TFC 75/85 US membrane filter (every 2-3 yrs)
3 x 532b, PAE RO Water Storage Pressure Osmosis Tank Container 4G
1 x FK-BB20M3, Special Big Blue Filter Pack Bundle for WH350 WH-350
1 x KF612UP, SUBSTITUTE/Upgrade Faucet Oil Rubbed Bronze Fisnish
1 x 213, 5th or 6th stage inline carbon filter (replace in 12 mons)
1 x 399, 4th stage TFC-100 US membrane filter (every 2-3 yrs)
1 x KF320UP, SUBSTITUTE/Upgrade Faucet BRUSHED NICKEL STAINLESS STEE
1 x 773, AC Booster Pump Assembly Large 150-200GPD RO systems SET
1 x *Discontinued* RD106
1 x 2nd stage C10 carbon block filter (replace every 6-12 months)
2 x OPTIONAL: 567 Filter Housing Wrench Case Opener WHOLE HOUSE WH
1 x MK300, Maintenance kit for RO535, RO435, RO545, AR104H
1 x SET68, AQUATEC 6840 AC Pump Set Solenoid ESO Pressure Switch SET
1 x 1070, PAE LARGE RO Storage Pressure Tank 14 GALLON 14G
1 x 4064K Male Connector Elbow 3/8 OD Compression Fitting 1/4 NPT
1 x 7044-K Union Tee Connector Fitting Compression type 1/4"
1 x Y3414BR, Garden Hose Y Adapter Shutoff Valve Brass Construction
1 x 532bpg, PAE RO water pressure tank blue bladder gauge valve 4G
1 x WT-bac, Water Testing Kit, Bacteria Test
1 x SET8855 Aquatec 5853 Booster Pump Assembly for Aeroponics System
1 x BBK10, Replacement Filter Big Blue Whole House WH-1134
1 x FM90, STEEL BRACKET SINGLE HOUSING MOUNTING BIG BLUE WH SYSTEM
2 x 719, Drain Saddle Clamp / Valve
1 x FM-6710M-88 1" Digital Flow Meter count up Total GPM 56" cable
1 x 225UP, 5th stage Inline Alkaline upgrade (includes media)
1 x .AR150P, AQUARIUM & DRINKING 2 OUTPUTS Reverse Osmosis RO+DI+P
2 x 752, DC Booster Pump w/ Transformer
1 x .RD322 Aquarium 260-300 GPD REVERSE OSMOSIS RO+DI WATER SYSTEM
1 x 4th stage TFC150 US membrane filter (every 2-3 yrs)M150 P/N3150
1 x SV-110AC-14, Solenoid Valve 1/4" plastic 110VAC ESO
1 x Annual Filter Kit Koolermax Series KPAK-4 Sediment Carbon Block
1 x KM701, Special Koolermax Filter Housing Canister Casing 1/4 FPT
1 x AQF-600-102, Flow Meter Panel Mount 3/8" MPT
1 x WH1134 Whole House Restaurant Filter System Sediment Carbon Big
1 x Optional 5th or 6th Stage upgrade inline DI filter(color change)
1 x 335UP, Upgrade Kit TFC 35 gal/day (includes US membrane filter)
1 x 213, 5th stage inline carbon postfilter (replace every 12months)
1 x 578, TDS Water Quality Meter tds-3
1 x FM-8100TG44, DigiFlow Digital Water Flow Rate Meter
1 x DM-1, Inline Dual TDS monitor (meter) for RO DI System DM1
1 x 3rd stage C10 carbon block filter (replace every 6-12 months)
1 x KT-103, Optional Manual Membrane Flush Valve
1 x FM40, STEEL BRACKET DOUBLE HOUSING 10" STANDARD
1 x Optional 566 Filter Housing Wrench Case Opener KoolerMax System
1 x B2012, 20" Long Slim Filter Cartridge Housing RO260 RD322
1 x MK800, Maintenance kit for AR122, AR125, HK120, RD150, RO155
1 x CBV-38, Tank Ball Valve to 3/8 tubing
1 x 727, Feed Water Adapter 3/8" compression adapter 1/4" inline bal
1 x PSW-360 Aquatec Pressure Switch 60 psi shut off 3/8" tubing TSO

View Cart$6,290.26

ATU TEE Union Connector Quick Connect QC Fitting [ATU]

$3.50

ATU TEE Union Connector Quick Connect QC Fitting



* ATU TEE Union Connector, Quick Connect

* Please choose size from the selection box below. Both numbers are tubing OD Outside Diameter. First number is Tee double side and second number is the single side. (Pipe sizes can be confusing even for the experienced user. Pipe size is not the actual outside or inside diameter of the pipe but is the industry accepted designation. If you have any question please email us first.)
* 1/4" Tube OD x 1/4" Tube OD ATU0404
* 3/8" Tube OD x 1/4" Tube OD ATU0604
* 3/8" Tube OD x 3/8" Tube OD ATU0606
* 1/2" Tube OD x 3/8" Tube OD ATU0706
* 1/2" Tube OD x 1/2" Tube OD ATU0707


* Water & foods use: Products are manufactured from safe, non-toxic materials meeting the requirements of the US FDA, ERAS, ANSI/NSF-51,61, and SK Zert. Our products are widely used in water purification, food/beverage, and pneumatic systems.

* Function & Quality: Provides quick and convenient assembly-saving time & expense.

* Collet Design: Our unique oval collet design is superior and more practical, and is an improvement welcomed by our world wide customers in all industries.

* Additional Applications: Beyond water and food use, fittings can be used with air, gases, vacuum, & liquids. All connections can be assembled & disassembled repeatedly. A broad range of sizes covers a broad scope of applications.

* We carry different fittings in variation of sizes: 1/4", 3/8", or 1/2" adapters, connectors, fittings, or valves.  Most are not listed online, to avoid confusion to majority of RO system customers.  

* Send us a message with specification, intended application, and image of your setup or old fitting  to check if we have what you need. 

Available Options:

Size Combination:

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